@F800 : Is your 5 GHz EE Wifi coming from a mobile router or a fixed Home BB Smart Hub router?
If the latter, Sometimes older or weaker devices may not be compatible with the default WiFi settings of EE Smart Hubs with their WPA3 Security. Try setting up Compatible WiFi on the router under Advanced > Wireless Settings > Config > Compatible WiFi (it defaults to 2.4 GHz only & WPA2) & connect your problematic 2.4 GHz or WPA2 devices to that. It presents itself as a separate network SSID of the form "MainSSID-Comp".
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To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Home Broadband & Home Phone or Option 2 for Mobile Phone & Mobile Broadband
ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
